spinal accessory nerve: The spinal accessory nerve is a cranial nerve that supplies the sternocleidomastoid and trapezius muscles. It is considered the eleventh of twelve pairs of cranial nerves, or simply cranial nerve XI, as part of it was formerly believed to originate in the brain. Anatomy : the spinal accessory nerve consists of both…
Vagus Nerve: The vagus nerve is the longest and most complex of the 12 pairs of cranial nerves that emanate from the brain. It transmits information to or from the surface of the brain to tissues and organs elsewhere in the body. Anatomy: The vagus nerve has two bunches of sensory nerve cell bodies, and…
What is a Glossopharyngeal Nerve? The glossopharyngeal nerve, known as the ninth cranial nerve (CN IX), is a mixed nerve that carries afferent sensory and efferent motor information. Sensory: Innervates the oropharynx, carotid body and sinus, posterior 1/3 of the tongue, middle ear cavity, and Eustachian tube. Special Sensory: Provides taste sensation to the posterior…
The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain. ANATOMY: The vestibular and cochlear portions of the vestibulocochlear nerve are functionally discrete, and so originate from different nuclei in the brain: Vestibular component – arises from the vestibular nuclei…
The facial nerve (also known as the seventh cranial nerve) is a nerve that carries signals from the brain to the muscles of the face. This nerve is responsible for the ability to move the muscles of the face, and it also carries information related to sensation in the face. Specifically, the facial nerve is…
TRIGEMINAL THE FIFTH NERVE: The trigeminal nerve (the fifth cranial nerve, or simply CN V) is a nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the largest of the cranial nerves. It has three major branches: the ophthalmic nerve (V1), the maxillary nerve (V2), and the…
CRANIAL NERVE: 3,4 AND 6occulomotor, trochlar and abducens OCULOMOTOR: The oculomotor nerve is the third cranial nerve (CN III). It enters the orbit via the superior orbital fissure and innervates extrinsic eye muscles that enable most movements of the eye and that raise the eyelid. The nerve also contains fibers that innervate the intrinsic eye…
What is an Optic nerve? The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves. The job of the optic nerve is to transfer visual information from the retina to the vision…
CRANIAL NERVE 1 : OLFACTORY Origin The olfactory nerve originates on the caudal surface of the olfactory bulb and crosses the cribriform plate of the ethmoid bone from one part of the crista galli process to the other, in order to reach the olfactory region of the nasal cavity. Terminal branchesThe olfactory nerves terminate in…
The cranial nerves are the nerves that come out of the brain. They are often called the “invisible” nerves because they pass through the skull and are not readily visible. They are responsible for signaling the body to do things like talking, chewing, and keeping your eyes focused. CRANIAL NERVES LIST There are 12 pairs…
